| 摘要 |
A wheel mounting assembly for a towed implement which permits vertical movement of a casterwheel, adjustment of the level of the implement above the terrain and also serves to return the implement to the desired height after vertical displacement thereof. The assembly includes a casterwheel, pivotally mounted in a caster bracket, which bracket is pantographically linked to an anchor bracket mounted on the implement. The pantographic linkage includes a height adjusting arm, one end of which is pivotally mounted to the caster bracket and the other end of which is pivotally mounted to the anchor bracket. The pantographic linkage also includes a control arm disposed beneath the height adjusting arm which is likewise pivotally mounted to the caster bracket and also to the rear of the implement in parallel relation to the height adjusting arm so as to form a pantographic linkage between the implement and the caster bracket. An adjusting rod extending through the anchor bracket engages the height adjusting arm to permit adjustment of the implement above the terrain. The adjusting rod carries a compression spring which biases the casterwheel downwardly and serves to return the implement to the desired height as the casterwheel moves upwardly upon encountering irregularities in the terrain over which the implement is towed.
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